1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * gpiolib support for Wolfson WM8994 4 * 5 * Copyright 2009 Wolfson Microelectronics PLC. 6 * 7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 * 9 */ 10 11 #include <linux/cleanup.h> 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/module.h> 15 #include <linux/gpio/driver.h> 16 #include <linux/mfd/core.h> 17 #include <linux/platform_device.h> 18 #include <linux/seq_file.h> 19 #include <linux/regmap.h> 20 21 #include <linux/mfd/wm8994/core.h> 22 #include <linux/mfd/wm8994/pdata.h> 23 #include <linux/mfd/wm8994/gpio.h> 24 #include <linux/mfd/wm8994/registers.h> 25 26 struct wm8994_gpio { 27 struct wm8994 *wm8994; 28 struct gpio_chip gpio_chip; 29 }; 30 31 static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset) 32 { 33 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 34 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 35 36 switch (wm8994->type) { 37 case WM8958: 38 switch (offset) { 39 case 1: 40 case 2: 41 case 3: 42 case 4: 43 case 6: 44 return -EINVAL; 45 } 46 break; 47 default: 48 break; 49 } 50 51 return 0; 52 } 53 54 static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 55 { 56 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 57 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 58 59 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 60 WM8994_GPN_DIR, WM8994_GPN_DIR); 61 } 62 63 static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset) 64 { 65 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 66 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 67 int ret; 68 69 ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset); 70 if (ret < 0) 71 return ret; 72 73 if (ret & WM8994_GPN_LVL) 74 return 1; 75 else 76 return 0; 77 } 78 79 static int wm8994_gpio_direction_out(struct gpio_chip *chip, 80 unsigned offset, int value) 81 { 82 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 83 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 84 85 if (value) 86 value = WM8994_GPN_LVL; 87 88 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 89 WM8994_GPN_DIR | WM8994_GPN_LVL, value); 90 } 91 92 static int wm8994_gpio_set(struct gpio_chip *chip, unsigned int offset, 93 int value) 94 { 95 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 96 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 97 98 if (value) 99 value = WM8994_GPN_LVL; 100 101 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, 102 value); 103 } 104 105 static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset, 106 unsigned long config) 107 { 108 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 109 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 110 111 switch (pinconf_to_config_param(config)) { 112 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 113 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 114 WM8994_GPN_OP_CFG_MASK, 115 WM8994_GPN_OP_CFG); 116 case PIN_CONFIG_DRIVE_PUSH_PULL: 117 return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, 118 WM8994_GPN_OP_CFG_MASK, 0); 119 default: 120 break; 121 } 122 123 return -ENOTSUPP; 124 } 125 126 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 127 { 128 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 129 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 130 131 return regmap_irq_get_virq(wm8994->irq_data, offset); 132 } 133 134 135 #ifdef CONFIG_DEBUG_FS 136 static const char *wm8994_gpio_fn(u16 fn) 137 { 138 switch (fn) { 139 case WM8994_GP_FN_PIN_SPECIFIC: 140 return "pin-specific"; 141 case WM8994_GP_FN_GPIO: 142 return "GPIO"; 143 case WM8994_GP_FN_SDOUT: 144 return "SDOUT"; 145 case WM8994_GP_FN_IRQ: 146 return "IRQ"; 147 case WM8994_GP_FN_TEMPERATURE: 148 return "Temperature"; 149 case WM8994_GP_FN_MICBIAS1_DET: 150 return "MICBIAS1 detect"; 151 case WM8994_GP_FN_MICBIAS1_SHORT: 152 return "MICBIAS1 short"; 153 case WM8994_GP_FN_MICBIAS2_DET: 154 return "MICBIAS2 detect"; 155 case WM8994_GP_FN_MICBIAS2_SHORT: 156 return "MICBIAS2 short"; 157 case WM8994_GP_FN_FLL1_LOCK: 158 return "FLL1 lock"; 159 case WM8994_GP_FN_FLL2_LOCK: 160 return "FLL2 lock"; 161 case WM8994_GP_FN_SRC1_LOCK: 162 return "SRC1 lock"; 163 case WM8994_GP_FN_SRC2_LOCK: 164 return "SRC2 lock"; 165 case WM8994_GP_FN_DRC1_ACT: 166 return "DRC1 activity"; 167 case WM8994_GP_FN_DRC2_ACT: 168 return "DRC2 activity"; 169 case WM8994_GP_FN_DRC3_ACT: 170 return "DRC3 activity"; 171 case WM8994_GP_FN_WSEQ_STATUS: 172 return "Write sequencer"; 173 case WM8994_GP_FN_FIFO_ERROR: 174 return "FIFO error"; 175 case WM8994_GP_FN_OPCLK: 176 return "OPCLK"; 177 case WM8994_GP_FN_THW: 178 return "Thermal warning"; 179 case WM8994_GP_FN_DCS_DONE: 180 return "DC servo"; 181 case WM8994_GP_FN_FLL1_OUT: 182 return "FLL1 output"; 183 case WM8994_GP_FN_FLL2_OUT: 184 return "FLL1 output"; 185 default: 186 return "Unknown"; 187 } 188 } 189 190 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 191 { 192 struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); 193 struct wm8994 *wm8994 = wm8994_gpio->wm8994; 194 int i; 195 196 for (i = 0; i < chip->ngpio; i++) { 197 int reg; 198 199 /* We report the GPIO even if it's not requested since 200 * we're also reporting things like alternate 201 * functions which apply even when the GPIO is not in 202 * use as a GPIO. 203 */ 204 char *label __free(kfree) = gpiochip_dup_line_label(chip, i); 205 if (IS_ERR(label)) { 206 dev_err(wm8994->dev, "Failed to duplicate label\n"); 207 continue; 208 } 209 210 seq_printf(s, " gpio-%-3d (%-20.20s) ", i, 211 label ?: "Unrequested"); 212 213 reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i); 214 if (reg < 0) { 215 dev_err(wm8994->dev, 216 "GPIO control %d read failed: %d\n", i, reg); 217 seq_printf(s, "\n"); 218 continue; 219 } 220 221 if (reg & WM8994_GPN_DIR) 222 seq_printf(s, "in "); 223 else 224 seq_printf(s, "out "); 225 226 if (reg & WM8994_GPN_PU) 227 seq_printf(s, "pull up "); 228 229 if (reg & WM8994_GPN_PD) 230 seq_printf(s, "pull down "); 231 232 if (reg & WM8994_GPN_POL) 233 seq_printf(s, "inverted "); 234 else 235 seq_printf(s, "noninverted "); 236 237 if (reg & WM8994_GPN_OP_CFG) 238 seq_printf(s, "open drain "); 239 else 240 seq_printf(s, "push-pull "); 241 242 seq_printf(s, "%s (%x)\n", 243 wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); 244 } 245 } 246 #else 247 #define wm8994_gpio_dbg_show NULL 248 #endif 249 250 static const struct gpio_chip template_chip = { 251 .label = "wm8994", 252 .owner = THIS_MODULE, 253 .request = wm8994_gpio_request, 254 .direction_input = wm8994_gpio_direction_in, 255 .get = wm8994_gpio_get, 256 .direction_output = wm8994_gpio_direction_out, 257 .set = wm8994_gpio_set, 258 .set_config = wm8994_gpio_set_config, 259 .to_irq = wm8994_gpio_to_irq, 260 .dbg_show = wm8994_gpio_dbg_show, 261 .can_sleep = true, 262 }; 263 264 static int wm8994_gpio_probe(struct platform_device *pdev) 265 { 266 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 267 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 268 struct wm8994_gpio *wm8994_gpio; 269 270 wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio), 271 GFP_KERNEL); 272 if (wm8994_gpio == NULL) 273 return -ENOMEM; 274 275 wm8994_gpio->wm8994 = wm8994; 276 wm8994_gpio->gpio_chip = template_chip; 277 wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX; 278 wm8994_gpio->gpio_chip.parent = &pdev->dev; 279 if (pdata && pdata->gpio_base) 280 wm8994_gpio->gpio_chip.base = pdata->gpio_base; 281 else 282 wm8994_gpio->gpio_chip.base = -1; 283 284 return devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip, wm8994_gpio); 285 } 286 287 static struct platform_driver wm8994_gpio_driver = { 288 .driver.name = "wm8994-gpio", 289 .probe = wm8994_gpio_probe, 290 }; 291 292 static int __init wm8994_gpio_init(void) 293 { 294 return platform_driver_register(&wm8994_gpio_driver); 295 } 296 subsys_initcall(wm8994_gpio_init); 297 298 static void __exit wm8994_gpio_exit(void) 299 { 300 platform_driver_unregister(&wm8994_gpio_driver); 301 } 302 module_exit(wm8994_gpio_exit); 303 304 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 305 MODULE_DESCRIPTION("GPIO interface for WM8994"); 306 MODULE_LICENSE("GPL"); 307 MODULE_ALIAS("platform:wm8994-gpio"); 308